1: for a task if it has been converted to a project I would like to add these fields so I know it has been converted: project reference number, project name, etc
2: for a Project if it was originally a task converted to a project (task reference number, task name, etc)
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As far as I am aware, this is not possible when a project is created from a task. The original task is always deleted when it is converted into a project so you can't report on the originating task object as it no longer exists in the system.
I believe that what you are asking is only possible when an issue / request is converted into a project.
I agree with Richard, so if you're trying to audit history, that boat has sailed, but if you're instead trying to create a process for future Task to Project conversions and are game to unravel a gossamer thread of faint hope, invite you to consider (untested)...